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the ancient Greeks knew of all of the following planets EXCEPT Uranus
the sun produces energy by nuclear fusion
what layer are you looking at an image of the sun photosphere
the solar wind is a stream of electrically charged particles that extend outward from the sun's corona
In a heliocentric system, Earth revolves around the sun
what do all of the inner planets have in common they all are small and have rocky surfaces
aside from Earth, which inner planet once had liquid water on its surface mars
the atmosphere of the gas giant cannot escape into space because the planets have very strong gravitational pulls
what do the first four inner planets have in common they are about the same size as Earth and are made mainly of iron
astronomers predicted the existence and orbit of Neptune based on Neptune's gravitational effect on the orbit of Uranus
the fact each planet's orbit is an ellipse was discovered by Kepler
what shape are the orbits of most comets long, narrow ellipses
meteoroids usually come from comets or asteroids
when a meteoroid enters earth's atmosphere, it produces a streak of light called a(n) meteor
scientists have discovered that life forms on earth exist in a very wide range of condition
which of the inner planets does NOT show evidence of volcanic activity Mercury
Saturn's rings are made up of mostly of chunks of ice and rock
Uranus is different from most other planets because it rotates on its side
Neptune is very similar in size and color to Uranus
which is the smallest terrestrial planet Mercury
true or false earth is thought to be at the center of the solar system in the g-e-o-c-e-n-t-r-i-c true
true or false all of the t-e-r-r-e-s-t-r-I-a-l planets have many moons false/ gas giants
true or false the sun's surface layer is the p-h-o-t-o-s-p-h-e-r-e true
true or false the number of sunspots on the sun varies over a period of about 1-1- y-e-a-r-s true
true or false the first four i-n-n-e-r planets are gas giants false/ outer
true or false the g-a-s g-i-a-n-t-s are small, dense, and have rocky surfaces. false/ terrestrial
true or false the Great Red Spot is a huge storm on S-a-t-u-r-n false/ Jupiter
true or false most comets are found in either the Oort cloud or the a-s-t-e-r-o-i-d b-e-l-t false/ Kuiper belt
true or false a comet or asteroid can break up to form a chunk of rock called a meteroid true
the planets that are closer to the sun than Earth are Venus and ________ Mercury
a meteoroid that hits earth's surface is called a(n) _______ meteor
_________ discovered Jupiter's four largest moons Galileo
energy is transferred from the sun's core toward the convection zone mainly in the form of _____________ I don't know
the sun's ________,which looks like a halo, can usually be seen during a solar eclipse regions of a surface corona
regions on the surface of mars have patterns that appear to have been made by __________ volcanoes
the __________ consists of the sun, nine planets and their moons, and several kinds of smaller objects solar system
mar's atmosphere is mostly _____________ carbon dioxide
Jupiter's Great Red Spot is a(n)_________ larger than Earth storm
_____________ is the only planet that has a lower density than water Saturn
Created by: nailahab